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@ variables in Ruby on Rails
...silent dup of variable, or making it 'const' so that it can't be modified, etc)? I'm coming from a C/C++ & Java perspective, and the really vague and optional syntax is driving me nuts!
– Dan Devine
Jun 13 '18 at 18:05
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TypeError: unhashable type: 'dict'
...
just a note @StevenDu dictionaries do not guarantee order, so str(my_dict) could return two different strings for the same (or different, but equivalent) dicts
– K Raphael
Mar 14 '17 at 16:38
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nginx: [emerg] could not build the server_names_hash, you should increase server_names_hash_bucket_s
...hash_bucket_size 64;
at the top of your http block (probably located in /etc/nginx/nginx.conf). I quote from the nginx documentation what to do when this error appears: In this case, the directive value should be increased to the next power of two. So in your case it should become 64.
If you still...
How to use Global Variables in C#?
...me namespace):
String code = Globals.CODE_PREFIX + value.ToString();
In order to deal with different namespaces, you can either:
declare the Globals class without including it into a specific namespace (so that it will be placed in the global application namespace);
insert the proper using dire...
List columns with indexes in PostgreSQL
...um = ANY(ix.indkey)
and t.relkind = 'r'
and t.relname like 'test%'
order by
t.relname,
i.relname;
table_name | index_name | column_name
------------+------------+-------------
test | pk_test | a
test | pk_test | b
test2 | uk_test2 | b
test2 | uk_te...
MySQL DISTINCT on a GROUP_CONCAT()
...UP_CONCAT has DISTINCT attribute:
SELECT GROUP_CONCAT(DISTINCT categories ORDER BY categories ASC SEPARATOR ' ') FROM table
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Big O, how do you calculate/approximate it?
... // 3
}
}
The first thing you needed to be asked is the order of execution of foo(). While the usual is to be O(1), you need to ask your professors about it. O(1) means (almost, mostly) constant C, independent of the size N.
The for statement on the sentence number one is tricky....
Error Code: 2013. Lost connection to MySQL server during query
...
Add the following into /etc/mysql/cnf file:
innodb_buffer_pool_size = 64M
example:
key_buffer = 16M
max_allowed_packet = 16M
thread_stack = 192K
thread_cache_size = 8
innodb_buffer_pool_size = 64M
...
Rails - Nested includes on Active Records?
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how to add there a order?
– Florian Widtmann
Jan 12 '16 at 7:49
6
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Two divs, one fixed width, the other, the rest
...;/div>
CSS:
.left {
overflow: hidden;
min-height: 50px;
border: 2px dashed #f0f;
}
.right {
float: right;
width: 250px;
min-height: 50px;
margin-left: 10px;
border: 2px dashed #00f;
}
You can also do it with display: table, which is usually a better approac...